Rincewind

Rincewind the wizard was working at a retail store. The front end of the store looked like a small wooden market stall, but inside it was much bigger, and looked more like a Costco-style warehouse. A customer, whose face was obscured inside a hood, brought a magical item to the counter and accused Rincewind of stealing it. Rincewind expressed surprise at this accusation, then went into the back and retrieved a matching item from a shelf. When he brought it to the counter, the manager was there and said that the item was unique, so one was a temporal copy of the other. He then demanded to know why Rincewind had stolen one of them. Suddenly the two items glowed, white electricity crackled between them, and a temporal rift opened behind the customer.

Rincewind, realizing he was going to lose his job no matter what, grabbed one of the items and jumped into the rift, which closed behind him. Then a second copy of Rincewind, who was hiding in the shadows nearby, jumped out and grabbed the other item and ran down an alley with it. The customer then pulled back his hood and revealed that he was an older Rincewind from the future. He asked the manager for a job, seeing how he was short an employee.